The Hydro Crunch 630-Watt Ceramic Discharge Metal Halide grow light kit delivers a light spectrum that's much closer to natural sunlight than typical high intensity discharge (HID) systems. A higher temperature creating light much closer to the suns. Being able to operate more efficiently at higher temperatures means a boost in performance. Coverage area is 4 ft. x 4 ft., that means bigger harvest and less cost. Two 315-Watt CMH Lamps (3100K bulbs) provides the full light spectrum, so it can be used for both veg and bloom stages. The lamp is optimized for the bloom phase with enhanced reds, but because it's full-spectrum, it will produce the goods in both vegetable and flower expect to see increased growth rates, tighter internodes, an improvement in overall vigor and an increase in final weight.